Malicious PDF — malware analysis report

Static analysis result for SHA-256 1899dd2156f7bb2e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 08:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f12bcda7c79580bf6820900bd9208f7 SHA-1: 4ba76f9cee63efb908c9e0dfa567675309616599 SHA-256: 1899dd2156f7bb2e11f7217e676f237a9553d0fe4878ca43702189cd4bfd8b9e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=sms+backup+%26+restore+app PDF link annotation
    • http://goldenteriyaki.com/uploads/files/26985311737.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7cb5781d4574c498e1024662cc93e411/popodapepar.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/bilimadukumejaxepe.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/91757546024.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/32031039620.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/12794110988.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/49229965345.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kikadedugino.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921111718.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/ludolejulizekumoj.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/10361384229.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/39954128915.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/milobiduxug.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109160400405018.pdfIn PDF document text
    • https://demoliman-host168-com.twbiz.me/data/html_editor/files/73370415323.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/pijakixewawutudap.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rakozadamivokewu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/seroremikatimebejawoz.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/46562686151.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/jagejefawu.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/rufawigabanirewuxaxij.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/kegadusalumilasotip.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/47t8pfg7gal2mgmovb4r77hpbvg6apne/6989558058.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 10248 bytes
SHA-256: de2fa12bd4495e333fc8bffdabdce9fcfc64ff607ce81bf4a9fce5813e8be185
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 17408 bytes
SHA-256: 87a758dc134d123fb011bee7b447daa03d395685be357d7aaa2559e5cf11f228
font_02_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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